Inner tube



J. L. HAYES June 17, 1930.

INNER TUBE Filed July 17, 1929 Patented June '17, 1930 PATENT OFFICE JAMES I1. HAYES, OI OTTAWA, ILLINOIS BIKER TUBE Application filed my 17,

readily noticeable without the necessity of v using a testing gauge.

Another object of the invention is to provide a tube constructed in such manner that the driver will know instantly when the tube is under inflated or totally deflated, thus preventing riding on an under inflated tire which, as is well known, will be subjected to bruises and rim cuts, and is generally detrimental to the tire and tube.

With these and other objects in view, this invention resides in the novel features of 5 construction, formation, combination and arrangement of parts to be hereinafter more fully described, claimed and illustrated in the accompanying drawing, in which:

Figure 1 is a cross sectional view taken through the tube.

Figure 2 is a transverse View through the tube.

Referring to the drawing, the numeral 1 designates the inner tube which is provided with the usual inflation valve 2, said tube being confined within the usual casing equipped with the conventional form of rim, the rim being secured to the vehicle wheel in the customary manner.

At spaced intervals, the inner surface of the tube 1 is provided with opposed projections 3 and 4, the pro'ection carried by the inner circumference o the tube being gradually thickened longitudinally toward its 5 center and being convex in cross section,

as at 5.

The projection carried b the outer periphery of the tube is also thickened longitudinally toward its center but is concave in so cross section, as at 6.

cross sectional 1929. Serial 1T0. 879,047.

The respectiverojections are formed integral with the tu e during the manufacture thereof.

I have illustrated two sets of projections which are disposed at opposite points of the tube in order to balance the tire. The number of projections may be increased if desired and, in fact, one set of projections may be used, but the balancing effect would be lost.

-Obviously, when the tube is under inflated, the projections will be moved into interfitting' relation, that is to say, the concavity of the projections 4 will receive the convex surfaces of the rojections 3. Thus, the respective projections will interfit and prevent lateral swaying or swinging of the casing as well as the tube, thus holding the casing and tube in a position to prevent rim cuts of the casing and twisting of the tube. In this manner, the life of the tube and easing will be rolonged.

As soon as t e pro'ections engage due to under inflation of the tube, a noticeable bumping action will result, thus notifying the driver that the tire is under inflated.

The'size of the projections is such that said projections will in no way interfere with the flexibility of the tube and casing. Therefore, under normal conditions, the presence of the projections is unnoticeable and will in no way afl'ect the riding qualities of the tire.

From the .foregoing, it is thought that the operation and many advantages of the herein described invention will be apparent to those skilled in the art without further description, and it will be understood that various changes in the size, shape, proportion, and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

What is claimed is:

1. An inner tube for pneumatic tires provided with interior means for indicating under inflation by causing a bumping of the wheel, the same consisting of opposed projections, each decreasing in thickness from a central point toward opposite ends and sides.

15 bemg convex longitudinally an 2.' An inner tube for pneumatic tires provided with interior opposed projections forming an integral part of the tube, each projection decreasing in thickness from a 5 central point toward opposite ends and sides.

3. An inner tube for pneumatic tires provided with interior oppgsed projections, the face of one projection ing convex and the opposing face if the coacting projection being concave.

4. An innertube for pneumatic tires provided with interior opppsed. projections the face of one projection eing convex and the opposing face of the coacting (projection concavetransversely.

In testimony whereof I afiix m signature.

JAMES L. HAYE [1,. s.] 

